RSA encryption and decryption for special characters (àâäèéêë)

I am using Angular to encrypt the payload with publickey

publicKey: string = `-----BEGIN PUBLIC KEY-----

-----END PUBLIC KEY-----`;
let encryptedCredential = {};
const rsa = Forge.pki.publicKeyFromPem(this.publicKey);
Object.keys(empDetails).forEach(keyElement =>{
encryptedCredential[keyElement] = Forge.util.encode64(rsa.encrypt(empDetails[keyElement].toString()));


in the backend using dotnet where private key is stored in the server

backend code:

RSACryptoServiceProvider rsaCryptoServiceProvider = new RSACryptoServiceProvider();
using (TextReader privateKeyStringReader = new StringReader(File.ReadAllText(System.Web.HttpContext.Current.Request.MapPath("~\\RSA\\rsakey.pem"))))
{
AsymmetricCipherKeyPair pemReader = (AsymmetricCipherKeyPair)new PemReader(privateKeyStringReader).ReadObject();
RSAParameters rsaPrivateCrtKeyParameters = DotNetUtilities.ToRSAParameters((RsaPrivateCrtKeyParameters)pemReader.Private);

rsaCryptoServiceProvider.ImportParameters(rsaPrivateCrtKeyParameters);
}
var decryptedBytes = rsaCryptoServiceProvider.Decrypt(Convert.FromBase64String(cipherText), false);
return Encoding.UTF8.GetString(decryptedBytes, 0, decryptedBytes.Length);


when using the special characters in words, the decryption is not working properly like the text demoé is decrypted to demo�

Kindly let me know if there is any other to handle such scenarios.

Thanks in advance!!

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